Patent GB-651554-A (GB)
Title: Improvements in or relating to electrical recording arrangements
Inventor: BAKER GEORGE THOMAS
IPC: H04M3/08
Filed: 1948-06-23
Abstract: 651,554. Automatic exchange systems. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. June 23, 1948, No. 16918. [Class 40 (iv)] Faults detected by a routiner are signalled to a device which automatically records the identity and condition of the faulty apparatus and the time at which the fault is detected. When the routiner detects a fault it seizes the recording apparatus by earthing lead 10 to operate start relay ST and relay FS, the latter busying the apparatus to other routiners. FS also operates FSR to close contacts identifying the routiner. Relay ST earths start lead ST, Fig. 1, to initiate operation of the teleprinter, and causes operation through valve V of high-speed relay HS, which energizes HSR. Recording exchange and routiner.-In positions 1-3, wipers D2-4 transmit the code letters of the exchange to leads C1-5, the teleprinter distributer equipment earthing stop lead Z after each letter to operate ZR, which energizes magnet DDM, whereby when earth is removed from lead Z, ZR and DDM release to advance switch D. In position 4, wipers D2-4 transmit a space signal, and in positions 5-7 a three letter designation of the routiner over contacts fsr. A space signal is sent in position 8, and in position 9, wiper D3 operates relay A, while wiper D4 contacts lead C4, whereby subsequent signals cause figures to be recorded instead of letters. Recording faulty apparatus. When wiper D 1 leaves home position, HS restores to operate magnet HDM to start switch H hunting. Bank H4 is multipled to the indicating bank of the primary access switches of the routiner so that wiper H4 finds earth at the contact corresponding to a lighted lamp, to re-operate relay HS so that switch H is halted. When switch D reaches position 10, wiper D4 operates relays WF, KO, the latter re - energizing magnet DDM. The tens digit corresponding to the setting of switch H is transmitted over wipers D5 and HI, lead 0, 1 or 2 to relay group A-F, which marks leads C1-5 appropriately. When earth is removed from lead Z, ZR releases and the number relays A-F restore. With switch D in position 11, the units digit of the primary access switch is transmitted over wiper H3 in a similar. manner. Switch D steps on and HS releases to cause switch H to hunt for the secondary access switch on wiper H6. A space signal is transmitted in position 12 and the tens and units digits of the secondary switch in positions 13, 14. Switch H is again reset and a space signal, tens and units digits follow in positions 15-17 to indicate the test on which the fault was found. Recording time. A space signal in position 18 is followed by time signals over wiper D5 in positions 19-22, provided over leads HT, HU, MT, MU from apparatus described in Specification 651,553, wiper D3 holding the timing apparatus stationary over lead 12. A signal is sent over wiper D3 in position 23 to change the recording from figures to letters. Space signals are sent in positions 24, 25, wiper D4 in the latter position signalling the routiner to continue its operation and earth on wiper D2 releasing FS, FSR. Wiper D1, in position 22, releases HS to cause switch H to step on to home position, when HS reoperates to take switch D to home position. Modifications. The routiner may use secondary access switches of vertical and rotary type in which case the positions are identified by two digits 0-9. The device may be used for testing equipment in gas or electric distribution systems. Specification 524,341 also is referred to.